collagen
noun [ U ] uk/ˈkɒl.ə.dʒən/ us/ˈkɑː.lə.dʒən/
胶原蛋白
a protein found especially in the joints (= places where two bones are connected) of humans and animals
collagen implant/injection （作为整形美容手术的）胶原蛋白植入（或注射）
an injection of collagen into the lips or skin to make the lips appear larger or the skin appear younger and smoother
Collagen implants don't help the blemishes left by chicken pox or acne.
Facial procedures such as collagen implants are extremely popular.
The collagen injection caused her lips to swell terribly.
After numbing the area, the surgeon administered the collagen injection.
Fillers such as collagen injections typically disappear after around three months.